Vehicular Lamp Light Guide Spacing for Stable Light Distribution
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Solution Overview
Problem
Existing vehicular lamps face issues with heat accumulation between the light source and the light guidance body, leading to potential deformation and unintended changes in light distribution patterns due to insufficient heat dissipation.
Innovation Solution
The vehicular lamp design includes a substrate with specific spacing configurations, such as wider second spaces for gas flow and a heat sink with metal components to enhance heat transfer and dissipation, preventing heat accumulation and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the space between the light source and the light guidance body is reduced, then the lamp size is reduced, but heat accumulates causing deformation of the light guidance body
Solution Approach 1:
The invention introduces a width dimension variation in the spacing structure. The first space has a first width and the second space has a second width that is greater than the first width, creating a gradual expansion in the width direction. This dimensional change allows heat dissipation pathways to be extended without increasing the overall lamp volume significantly, resolving the contradiction between compact size and heat dissipation.
2Temperature
If the spacing between the light source and the light guidance body is increased, then heat dissipation is improved, but the lamp size increases
Solution Approach 1:
The invention employs asymmetric spacing design where the first space and second space have different widths. The first space closer to the light source has a smaller width, while the second space has a larger width. This asymmetric configuration optimizes heat dissipation by providing adequate spacing in the critical second region without uniformly increasing the overall lamp dimensions, thus resolving the contradiction between heat dissipation and compact size.
3Device complexity
If uniform spacing is provided between the light source and the light guidance body, then the structure is simple, but heat accumulates in certain regions causing deformation
Solution Approach 1:
The invention applies local quality variation by providing different spacing widths at different locations. The first space has a first width and the second space has a second width greater than the first width. This local differentiation addresses the specific heat accumulation problem in the second region by providing larger spacing where needed, while maintaining a relatively simple overall structure without requiring complex variable geometry throughout.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses heat-induced deformation of the light guidance body, maintaining consistent light distribution patterns by improving cooling efficiency and heat transfer.
Implementation Method 1
a light guidance body having an incident surface on which light from the light source is incident, the light guidance body being disposed between the light source and the projection lens and emitting the light toward the projection lens
Implementation Method 2
the light guidance body being disposed between the light source and the projection lens and emitting the light toward the projection lens
Implementation Method 3
heat generated by driving the light source and supplied from the light source is transferred to the base plate through the substrate
Implementation Method 4
each of the heat radiation fins radiates the heat
Implementation Method 5
Gas can easily flow through the second space as compared with a case in which the width of the second space is the same as the width of the first space. When the gas easily flows, heat is hardly accumulated between the light source and the incident surface
Data Source
AI summary
A vehicular lamp (100) includes a substrate (24), a light source (22a), a projection lens (30), and a light guidance body (40) having an incident surface (44a). A first space (201) is provided between a first region (441b) and the substrate (24), the first region (441b) including, on the incident surface (44a), a part of an outer peripheral edge of the incident surface (44a), and a second space (203) communicates with the first space (201) and is in contact with a second region (441c) including, on the incident surface (44a), the other part of the outer peripheral edge of the incident surface (44a). A width of the second space (203) is wider than a width of the first space (201) in an emission direction of the light from the light source (22a).